New Holland 3061 – ECU: Cylinder 1 – Injector Cable Short Circuit (Low Side To Battery)

The Engine Control Module (ECM) has detected a short circuit in the wiring for the cylinder 1 fuel injector. Specifically, the low-voltage control wire of the injector circuit is electrically shorted to a positive battery voltage source. This condition prevents proper operation of the injector, potentially causing it to stay open or closed, which results in engine misfires, rough running, and excessive smoke.

• T7 Series
• T7.220
• T7.235
• T7.250
• T7.260
• T7.270
• T8 Series
• T8.275
• T8.300
• T8.330
• T8.350
• T8.410
• T9 Series
• TG Series
• TG215
• TG275

1. 1

   Visually inspect the wiring harness leading to the cylinder 1 fuel injector for chafing, melting, or cuts in the insulation.

2. 2

   Examine the electrical connector at the cylinder 1 injector for corrosion, bent or broken pins, and ensure a secure connection.

3. 3

   Trace the injector harness back to the main engine harness and ECU to check for rubbing against engine components or visible damage.

4. 4

   Perform a short-to-power test: Disconnect the injector harness, turn ignition ON (engine off), and test both pins to ground with a multimeter. The low-side wire should show close to 0 volts; battery voltage confirms a short circuit to power.

5. 5

   Perform an injector coil resistance test: Measure resistance across the two pins on the disconnected fuel injector. Expect 12-16 ohms; significantly lower/higher readings or an open circuit indicate a faulty injector.

1. 1

   Isolate the fault

   Determine if the short circuit lies within the wiring harness or the ECU. Address any visible wiring issues first before attempting advanced ECU pin testing.

2. 2

   Repair or replace wiring

   If visible damage is found on the injector wiring harness, repair it using appropriate splice connectors and heat-shrink tubing. If damage is extensive or close to the connector, replace the injector harness or connector pigtail.

3. 3

   Replace the fuel injector (if faulty)

   If the injector coil resistance is out of specification, replace the injector. Clean the area, disconnect lines, and remove the hold-down bolt (use a puller if necessary). Install the new injector with a new copper sealing washer and lubricated O-ring. Torque injector bolts to 9 Nm + 75 degrees, fuel tube nut to 50 Nm, and harness nuts to 1.5 Nm (typical for FPT engines with Bosch injectors).

4. 4

   Clear codes and verify repair

   Reconnect the battery, start the engine, and use a diagnostic tool to clear the fault code. Operate the machine to ensure the code does not return and the engine runs smoothly.